1KZ is a 3.0 Liter SOHC Diesel engine with indirect injection.
1KD-FTE is a 3.0 Liter DOHC Diesel engine with Common Rail Injection.
The most famous vehicle in Pakistan to have the 1KD-FTE is the Toyota Hilux VIGO. 1KZ was also introduced with electronic fuel injection in its last years in production. The injection was still indirect.
Indirect injection means that fuel is delivered to a pre-combustion chamber from where the fuel ignites and spreads towards the piston. Local mechanics call it a "port".